How to pass JSON data to another view controller from login function using post method?

问题

I m having blank data in another view controller, I can pass data between table view controller but I m having a problem to parse data from login method and pass access token or username from JSON?

 @IBOutlet weak var username_textfield: UITextField!
    @IBOutlet weak var password_textfield: UITextField!
var logindata : [Login] = []
 var myResponse  :   JSON    =   nil
func getlogin(){
        let headers = [
            "Content-Type": "application/x-www-form-urlencoded"
        ]
        let parameters = [

            "UserName": username_textfield.text! as String,
            "Password": password_textfield.text! as String,
            "grant_type": "password",
            ]


        //        let url = NSURL(string: "http://192.168.100.5:84/Token")!
        Alamofire.request("http://192.168.100.5:84/Token", method: .post, parameters: parameters, encoding:  URLEncoding.httpBody, headers: headers).responseJSON { (response:DataResponse<Any>) in

            switch(response.result) {
            case.success(let data):
                print("success",data)
                 let statusCode = (response.response?.statusCode)!
                if statusCode == 200{
                    self.view.makeToast(message: "Welcome !!")
                    self.performSegue(withIdentifier: "mainview", sender: self)

                }else{
                    self.view.makeToast(message: "Username or password invalid")
                }
                self.myResponse = JSON(data)
            let login = Login(loginJson: self.myResponse)
            DispatchQueue.main.async(execute: { () -> Void in
                self.performSegue(withIdentifier: "pass_data", sender: login)
            })


            case.failure(let error):
                print("Not Success",error)
            }

        }
    }

passing data to another view controller

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "pass_data" {
        if let eventsVC = segue.destination as? MenuDrawerViewController,
            let loginData = sender as? Login {
            eventsVC.login_details = loginData
        }
    }
}

i have model class

class Login{

    var access_token = String()
    var token_type = String()
    var expire_in = String()
    var username = String()
    var masterid = String()
    var name = String()
    var access = String()
    var issued = String()
    var expries = String()

    init(loginJson:JSON){
    self.access_token = loginJson["access_token"].stringValue
        self.token_type = loginJson["token_type"].stringValue
        self.expire_in = loginJson["expires_in"].stringValue
        self.username = loginJson["userName"].stringValue
        self.masterid = loginJson["MasterID"].stringValue
        self.name = loginJson["Name"].stringValue
        self.access = loginJson["Access"].stringValue
        self.issued = loginJson[".issued"].stringValue
        self.expries = loginJson[".expires"].stringValue
    }


}

and in second view controller I have call class like this

class MenuDrawerViewController: UIViewController {
var login_details : Login?
 override func viewDidLoad() {
        super.viewDidLoad()



        titlename_text.text = login_details?.name
        // Do any additional setup after loading the view.
    }
}

I m a bit confused where I'm getting wrong or I'm doing it in wrong way, how it can be solved?

i want to pass data through navigation controller and without using navigation controller data is passed so i try this function to pass and it giving me error on "if let detailController" condition

override  func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "dashboard" {
            let navController = segue.destination as! UINavigationController
           if let detailController = navController.topViewController as! ViewController,
            let loginData = sender as? Login {
                detailController.login_details = loginData
            }
        }
    }

回答1:

For loop here is unnecessary because you are not getting array of Login data what you need is to directly use self.myResponse to make object of Login. Also you are performing segue twice with different identifier perform segue to specific identifier with your corresponding destination controller.

Alamofire.request("http://192.168.100.5:84/Token", method: .post, parameters: parameters, encoding:  URLEncoding.httpBody, headers: headers).responseJSON { (response:DataResponse<Any>) in

    switch(response.result) {
        case.success(let data):
            print("success",data)
            let statusCode = (response.response?.statusCode)!
            if statusCode == 200{
                self.view.makeToast(message: "Welcome !!")
            }else{
                self.view.makeToast(message: "Username or password invalid")
            }
            self.myResponse = JSON(data)
            let login = Login(loginJson: self.myResponse)
            DispatchQueue.main.async(execute: { () -> Void in
               self.performSegue(withIdentifier: "pass_data", sender: login)
            })
        case.failure(let error):
            print("Not Success",error)
    }
}

Now make your prepareForSegue like this

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "pass_data" {
        if let eventsVC = segue.destination as? MenuDrawerViewController,
           let loginData = sender as? Login {
              eventsVC.login_details = loginData
        }
    }
}

来源：https://stackoverflow.com/questions/44794383/how-to-pass-json-data-to-another-view-controller-from-login-function-using-post